The hydrodeoxygenation of erythritol, xylitol and sorbitol was investigated using a Pt-WOx / SiO2 catalyst (4% by weight Pt, W / Pt = 0.25, molar ratio). 1,4-Butanediol can be selectively produced in 51% yield (on a carbon basis) by erythritol hydrodeoxygenation at 413 K based on the selectivity to this catalyst for regioselective removal of the CO bond in the -OC-CH2OH structure. Since the catalyst is also active to some extent in the hydrodeoxygenation of other polyols, but is much less active in that of monoalcohols, monoalcohols can be made from sugar alcohols at higher temperatures (453 K). A good overall yield (59%) of pentanols can be obtained from xylitol, which was mainly converted to C2 + C3 products in the hydrogenolysis systems known from the literature. It can also be applied to other high-yield sugar alcohols for hydrodeoxygenation to monoalcohols, such as erythritol to butanols (74%) and sorbitol to hexanols (59%) with very small amounts of CC bond cleavage products. The Pt-WOx interface centers are suggested as the active center, which is supported by the reaction and characterization results (TEM and XAFS). WOx / SiO2 selectively catalyzed the dehydration of xylitol to 1,4-anhydroxylitol, while Pt-WOx / SiO2 promoted the conversion of xylitol to pentanols with 1,3,5-pentanetriol as the main intermediate. Precalcination of the reused catalyst at 573 K is important to prevent coke formation and improve reusability.


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